He took 7th at The Hague 1928 (Amateur World Championship, Max Euwe won).
[1] Carls represented Germany in Chess Olympiads: He won two team bronze medals (1930 and 1936).
[2] During World War II, he tied for 10-12th at Kraków – Warsaw 1941 (2nd GG-ch, Alexander Alekhine and Paul Felix Schmidt won).
Carls won, ahead of Klaus Junge, at Rostock 1942.
This biographical article relating to a German chess figure is a stub.